Denomination: '91Y81'
Botanical Name: Glycine max
Applicant/Holder: Pioneer Hi-Bred International, Inc.
8305 NW 62nd Avenue
P.O. Box 7060
Johnston, Iowa
United States of America
Breeder: Martin Fabrizius, Pioneer Hi-Bred International, Inc., Redwood Falls, United States of America
Agent in Canada: Pioneer Hi-Bred Production LP
379 Springbank Ave.
P.O. Box 23040
Woodstock, Ontario
N4T 1R9
Tel: 519-533-5151
Application Date: 2012-01-26
Application Number: 12-7485
Grant of Rights Date: 2015-06-26
Certificate Number: 5050
Date rights revoked: 2016-06-26

Variety Description

Varieties used for comparison: 'HS18RYS13' and '91Y74'

Summary: '91Y81’ flowers earlier than 'HS18RYS13’. The plants of '91Y81’ have a light tawny pubescence whereas those of 'HS18RYS13’have a grey pubescence. When 50 % of the pods are ripe, the plants of '91Y81’ are taller than those of the reference varieties. The seed shape of '91Y81’ is elongate whereas it is spherical flattened for '91Y74’ and spherical rounded for 'HS18RYS13’. '91Y81’ has a medium to large dark brown hilum whereas 'HS18RYS13’ has a small imperfect black hilum. '91Y81’ matures earlier than the reference varieties.


PLANT: oilseed type, indeterminate growth type, semi-erect growth habit, light tawny pubescence on middle third of main stem

HYPOCOTYL: strong intensity of anthocyanin colouration

LEAF: medium green colour, pointed ovate lateral leaflet

FLOWER: violet

POD: brown
SEED: elongate, dull lustre, yellow ground colour of testa, 19.6 grams per 100 seed at 13 % moisture
HILUM: dark brown, medium to large, normal abscission layer

AGRONOMICS: 2975 heat unit rating

QUALITY CHARACTERISTICS: 39.6 % protein, 21.1 % oil

Origin & Breeding History: '91Y81’ (experimental designations XB17V11, PH11109) is the result of a cross made in 2004 between '92M22’ and 'XB19V06’ in Puerto Rico. The modified single seed descent method and pedigree method were used to develop the variety. The F1-F2 generations were grown in Puerto Rico. The F3 was grown in Minnesota, USA and the F4 in Chili. The F5 generation onward were grown in Minnesota and advanced based on yield for single plants and progeny rows. Single plant purification occurred in 2008 in Minnesota. Wide area testing continued from 2009-2011 in the USA and Canada. Selection criteria included yield, maturity and resistance to Roundup branded herbicides, Phytophthora rot (Phytophthora megasperma f. sp. glycinea) and soybean cyst nematode (Heterodera glycines).

Tests & Trials: Test and trials for '91Y81’ were conducted in Thamesford, Ontario during the 2012 growing season. Plots consisted of 2 rows with a row length of 4 metres and a row spacing of 76 cm. Each plot was sown with approximately 225 seeds. There were 3 replications per variety arranged in a RCB design. The measured characteristics were based on 30 measurements per variety. Mean differences were significant at the 5% probability level based on LSD values. Results were supported by the official technical examination report 201100195, purchased from the Plant Variety Protection Office, Beltsville, Maryland, USA.

Comparison tables for '91Y81' with reference varieties 'HS18RYS13' and '91Y74'

Flowering Date (days)

  '91Y81' 'HS18RYS13' '91Y74'
mean 59 63 60

Plant height (cm)

  '91Y81' 'HS18RYS13' '91Y74'
mean (LSD=2.33) 67.1 58.9 62.2
std. deviation 7.6 5.0 7.8

Maturity Date (days)

  '91Y81' 'HS18RYS13' '91Y74'
mean 113 118 115

Click on image for larger view
Soybean: '91Y81' (center) with reference varieties '91Y74' (left) and 'HS18RYS13' (right)

Click on image for larger view
Soybean: '91Y81' (bottom) with reference varieties '91Y74' (top left) and 'HS18RYS13' (top right)

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